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Electric Circuits

Electric Circuits
Condition for reciprocity in case of ABCD parameters is

 AB-CD = 1.
 AD-BC = 1 .
 AD-BC = 0.
  AB-CD = 0.

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Electric Circuits
Which of following capacitors has relatively shorter shelf life?

 Paper.
 Glass.
 both (B) and (C) above.
 Electrolytic.

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Electric Circuits
Under resonance condition the power factor of a system is

 lagging
 leading
 any of the above
 unity

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Electric Circuits
Resistance of which material does not change with change in temperature?

 Brass.
 Metal alloys constantan and manganin.
 Tungsten.
 Platinum.

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Electric Circuits
In the circuit given, I = 1 A for Is = 0. What is the value of I for Is = 2 A ?

  2 A.
 3 A.
 4 A.
 1 A.

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Electric Circuits
Four resistances 80 Ohm, 50 Ohm, 25 Ohm and R are connected in parallel. Current through 25 Ohm resistance is 4A. Total current of supply is 10A. The value of R will be

 66.66.
 76.66.
 36.36.
 40.25.

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